Definition

According to wikipedia:

A confidence band is used in statistical analysis to represent the uncertainty in an estimate of a curve or function based on limited or noisy data.

Videos

Data Analysis videos shared this YouTube video:

And Andy Kriebel shared this one:

Blog posts

Andy also accompanied his video with a blog post:

http://www.vizwiz.com/2015/10/tableau-tip-tuesday-create-great.html?m=1

The Online Tableau Help resource gives an overview of all the Analytics tools here:

https://onlinehelp.tableau.com/current/pro/online/mac/en-us/reflines_types.html

And tekslate.com shared a concise overview of Tableau reference lines and bands:

http://tekslate.com/reference-lines-and-bands-in-tableau/

Interworks posed a similar blog post:

https://www.interworks.com/blog/anonymous/2012/04/09/adding-different-reference-lines-tableau

Example workbooks

The workbook from Andy Kriebel’s blog is available on Tableau Public here:

https://public.tableau.com/views/ConfidenceBands/Title?:embed=y&:display_count=no&:showTabs=y&:showVizHome=no

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